Belt and process of making the same



May 13. 1924. 1,494,075

L. MURRAY BELT AND PROCESS OF MAKING THE SAME iled Nov. 28, @921 3' Sheets-Sheet 1 r INVENTOR- LEE MURRHY 6341 dP Q i/farncy:

May p L. MURRAY BELT AND PROCESS OF MAKING THE SAME Filed Nov. 28, 1921 3 Sheets-Sheet 2 CORE 1/ IN YEN TOR May 13, 1924. 1,494,075

L. MURRAY BELT AND PROCESS OF MAKING THE SAME Fileq Nov. 28 1921 3 Sheets-Sheet 5 I N YEN *on LEE Mum/1r ii atented iii/lay li'll,

LEE MUBEAY, @IZ EIHNEA'JPQKJS, MSIIGNOB. EQ DUEKEEPAWGSD ($21- .?MTY, @115 containers ms, MINNESQTA, A GQEJPQBAMQE @ll n rmrrrsore.

new new rnocrss or manure s Application filed li'ovember QB, rear. tie riot 53o. eraser.

To aZZ whom it may concern;

Be it known that l, Len MURRAY, a citizen of the (United States, resident of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Belts and Processes of l /laking'the Same, of which the {following is a specification.

My invention relates to the so-called round type, used generally for transmitting a light power, and hence adapted for a great variety of uses.

The primary obi-eel; of my present inven tion is to provide a belt composed of suitable fabric, preferably rubberized, and including means for limitinglthe degree of stretch of the belt and at the same time malring it much stronger and more durable.v

My invention consists generally in a belt of' the construction hereinafter described and a process of making such a belt.

In the accompanying drawings forming part or this specification,

Figure l is a plan view ofa form or man drel showing the manner oi placing and rolling the fabric thereon,

Figure 2 isa similar view illustrating the belt in its completed or rolled form,

Figure 3 is a detail sectional view, show ing the manner oi assembling the difi'erent elenrients used in the making of the belt upon the conical form or mandrel,

Figure t is a perspective view oil the flexible pad or filler that is inserted between the inner fabric sheet and the surface of the term, t

Figure 5 is a detail sectional view on a section line 5-5 oil Figure 1,

Figure 6 is a similar view on sectionline at of Fix ure 1!,

Figures and 8 aredetail views of the sheets of iabricoii which the belt is corn sheet and the form permits rollin ing the term, however, is iaterial and maybe modified in various ways. In carrying out my process, ll place on the lar r end of the form a ring or pad 4 of suite is yielding material. As shown, theends oi this ring may be beveled, as at 5, and preferably are fastened together by suitable means, such as a strap 6 having the wellknown snap fasteners 1?. This ring is tapered from one end to the other, thereby increasing in thiclmess from its enter toward its inner end, as indicated plainly in Figure 3, the object of this taper being to compensate for or odset the taper of the form so that when the first or inner sheet of fabric is applied, it will lie smoothly and evenly on the pad and be substantiy the same diameter from end to end. The sheet of iabric is indicated by reference numeral 8. The pad interposed between this of the tubewith the reinforcing means'laid thereon, and in practice, i prefer to make the diameter or the pad ring greater at its inner end,*t-hns necessitating a diagonal cut of the sheet or fabric applied thereto. This is for the purpose of making the fabric tnbe sudiciently loose or slaclr on the iorm to allow the rolling out the reinforcing means therein to be completed when the pad is removed.

For the purpose of stren honing the beltand reducing the degree ostretch therein, it provide a reinforcing means consisting preferably of a cord 9, preferably of cotton fabric, laid on the sheet 8 and wrapped continnously around the form, as indicated by dotted lines in Figure l. The loops or con volutions oi the cord are distributed a suitable distance apart on the surface of the ifabric sheet and over them l place a thin sheet oil rubber it), which conceals the cord and also covers the rubberized sheet beneath. I The reinforcing cord ice is are held in place on the fabric tribe by t e rubber sheet to during the rollin operation and. the said sheet serves as a binder ior uniting the cord and the convolntions oi? the "fabric tube into a homo eneons compact mass when the belt is competed and-vnlcanized. The cord loops are shown in Figure lit steeped around the core and embedded in the soft rubber sheet is and between the convohr tions of the labric, rap pnrpoee to llill range them as near as ma be possible in symmetrical form around t e center of the belt and where the strain thereon will be substantially uniform.

At the outer end of the sheet 81 lace a "core ll of suitable material, preferab soft tiall rubber, extending entirely around the form with its ends united, as indicated in Figure 1. This core lies at the outer edge. of the rubberized sheet 8 and forms the center of the belt when the rollin process is be on. When these parts have con assemble/(1% as described, the operator will roll the fabric sheet 8 over upon the core ll, and when.

of t e second sheet of fabric 12 that is wrapped around the tapered end of the form and when the inner end of this tube is reached, the rolling action will be continued, the decreasing diameterof the form offsetting the increasing size of the belt, due

to the rolling of the fabric thereon. .W'hen the belt reaches the smaller end of the form, as indicated in Figure 2, it will assume the shape and form indicated in Figures 9, l0 and -ll, the soft rubber core occupying, of

course, the center oil the belt section, with till the cord loops grouped symmetrically around it, lying in the soft rubber sheet which is shown in irregular form in the sec tion. and intertwined with the inner end of the fabric sheet 8. Il havelound that a belt "made in this way will be stronger and less inclined to stretch unduly than when the cord loops are omitted and while various ways may be devised for arranging the cord loops in or between the convolutions of the fabric, l prefer to dispose them substantially as shown herein. The cord loops laid in the belt having practically no stretching quality, it is necessary to interpose the pad between the first sheet of fabric and the form or otherwise only a few rolls or con volutions could be made in the belt when the cord loops would become so tight that further rolling would be impossible. The use of this pad allows the first flew convolutions to be made and then the pad may be removed and the rolling oi the cord loops in the fabric completed. lllhen this has been done, the outer fabric sheet can be readily rolled in its tubular form, aided by the decreasing dia-ineter off the iornn.

The procesabricfiy, is as follows: I place the tapered pad on. the surface oi the town or mandrel, encircle it with a sheet of fabric cut to fit smoothly on the surface of the nod and town tube, Tl then place a second sheet mo ers of fabric on the form, cut to fit the taper thereof, as indicated, and forming a second tube, one end of which is close to the inner end of the pad. On the peripheral surface of the first tube I place at one end a core ring and then at intervals on the surface of the tube 1 place thereinforcing means, preferably the cotton cord, I then cover this cord with a thin sheet of comparatively soft material, such as rubber, which will adhere to the cord loops and to the surface of the tube and hold the cord loops in place while the tube is being rolled. I then begin the rolling operation, turning the edge of the outer end of the tube over the cord and roll ing the loops into the convolutions. v As the convolutions are formed, the cord loops will become tighter andsoon will prevent further rolling, and I then loosen the ad and remove it from the form. This a-l ows the tube to drop'onto the surface of the form and provides suficient SlMlt for the tube and cord loops to allow the rolling operation to be completed to the end of the tube. When this has been done I continue the rolling opthe first tube and when the end of the sec- 0nd tube is reached, the belt will be ready for the vulcanizing operation.

lclaiin as my invention:

1. A process of rnalrin which consists in forming a tube of flexible material, placing-reinforcing means at intervals thereon andthen rollin one edge of the material from one end of t e tube towards theother end thereof, Y I

2. A process of belt me i which cona n 1 l sists in rorunng a tube til-flexible material, placing reinforcing cords thereon, and then rolling one edge of the material from one end of the tube towards the other end thereof.

3. A process of belt malrin which consists in forming a tube oi suitable fabric, placing a reinforcing cord on the surface of the tube at suitable intervals, then rolling one edge of the fabric from one end of the tube towards the other end thereof.

4. A process of belt Ina-kin which con sists in lorming'a tube of flexible material, placing reinforcing means at suitable inter vals on the peripheral surface thereof, rolling one edge of the material from one end of the tube towards the other end thereof, and then vulcanizing the belt so formed.

5. A recess of belt making which consists in iorming a tube or flexible material, placing reinforcing means at suitable intervals on the peri heral surface thereof, roll ing one edge o the material over one end of the tube towards the other end thereof, and then vulconizing the belt so lonrncd,

6. A process or" belt rocking which con sists in forming a tube oi? rubberized fabric,

anors v placing reinforcing means thereon at intervals, then rolling one edge of the fabric from one end of the tube towards the other end thereof.

7. A recess of belt making which consists in orming a tube of rubberized fabric having its warp and woof threads running diagonally upon the surface of the tube, placing reinforcing means circumferentially on the surface of the tube, then rolling one edge of the fabric from one end of the .tube towards the other end thereof.

8. A process of belt making which consists in forming a frusto-conical tube of rubberized fabric, placing reinforcing means at intervals on the circumferential surface thereof, then rolling one'edge of the fabric from the large end of the tube towards the other end thereof.

9. A recess of belt making, which consists in orming a frusto-conical tube of rubberized fabric having its warp and woof threads. running diagonally thereof upon the surface of the tube, placin reinforcing means circumferentially on t e surface of the tube, then rolling one edge of the fabric from the larger towards the smaller end of the tube. a

10. A process of belt making which consists in forming a tube of suitable material, placing on the circumferential surface thereof a series of reinforcing members, rolling one edge of thematerial from one end of the tube toward the other end thereof, thereby forming a ring belt that is circular substantially in cross section, and then vulcanizing the belt so formed. I

11; A process of belt making which consists in forming a tube of flexible material, placing on the circumferential surface thereof a series of reinforcing members, adding a suitable binder'to said members, and then rollin one edge of the'material from one end 0 the tube toward the other end thereof.

12. A process of belt making which consists in forming a tube of rubberized fabric, placing on the peripheral surface thereof a series of reinforcing members, placing a rubber binder on said members, then roll ing one edge of the fabric from one end of the tube toward the other end thereof.

' 13. A processof belt makin which consists in forming a tube of flexi le material, placing an annular core of soft material thereon at one end, then laying a reinforcing cord at intervals on the peripheral surface of the tube and finally rolling the edge of the tube adjacent the core toward the other end thereof.

14. A process of belt making which consists in forming atube of flexible material, placing thereon at one end a core ring of yielding material, placing on the peripheral surface of the tube a reinforcing member,

coveringsaid member with a sheet of flexible material, and then rolling the tube from the end adjacent to the core towards the other end thereof.

15. A process of belt making which consists in placing a pad of suitable material upon a form, stretching a sheet of flexible material around said pad to form a tube, placing a non-stretching reinforcing 'memher on the surface of said tube, rolling the tube from one end toward the other until several convolutions are, formed, then removing said pad and continuing the rolling operation to the other end of the tube.

16. A process of belt making which consists in placing a tapered pad of yielding material upon a suitable form, wrapping a sheet of flexible material around said pad to form a tube, placing a core of ieldmg material on said tube at one end, aying a reinforcing cord on the surface of said tube at intervals, rolling said tube over said core until the fabric is taut, then removing the pad and continuing the rolling operation to the other end of the tube.

17. A process of belt makin which consists in placing a tapered pa of yielding material upon a suitable form, wrapping a sheet of flexible material around said ad to form a tube, placing a core of yiel mg material on said tube at one end, laying a reinforcin at interva s, laying a sheet of flexible material over the cord, rolling said tube over said core until the fabric is taut, then removing the pad and continuing the rolling operation to the other end of the tube.

\ 18. A process of belt makin which consists in placing a pad of yiel ing material upon a form, wrapping a sheet of flexible material around said pad to form a tube, wrapping a second sheet of flexible material cord on the surface of said tube around the form at one end of said pad,

around a form at one end of said pad, placing a core around one end of the tube formed of said first sheet, laying a reinforcing means on the peripheral surface of said first sheet, coverm said remforcm means with a suitable binder, rolling sai first sheet from one end over said core and reinforcing means toward the other end, removingsaid pad and finall rolling said second sheet over the rolled rst sheet.

20.'As a new article of manufacture, a

jointless, endless belt circular substantially in cross section composed of convolutions of fabric, a core and a reinforcing means.

21. As a new article of manufacture, a belt circular substantially in cross section composed of a fabric tube rolled upon itself rolled from one end towards the other, and

a plurality of reinforcing cord loops interposed in the convolutions of the fabric.

23. As a new article of manufacture, 8.

belt circular substantially in cross section composed-of a rubberized fabric tube rolled from one end towards the other, a central core and reinforcing members interposed in the convolutions around said core.

24. As a new article .of manufacture, a belt circular substantially in cross section comprising a fabric tube rolled upon itself from one end towards the other, a core thereof, reinforcing means interposed in the convolutions of the fabric, and a binder in which the reinforcing means are embedded.

In witness whereof, I have hereunto set .my hand this 25th day .of November, 1921.

LEE MURRAY. 

